linux-kernel - [PATCH 2/4] maple_tree: Simplify mas_wr_node

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Message-Id: <20230310140848.94485-3-zhangpeng.00@bytedance.com>
Date:   Fri, 10 Mar 2023 22:08:45 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        maple-tree@...ts.infradead.org,
        Peng Zhang <zhangpeng.00@...edance.com>
Subject: [PATCH 2/4] maple_tree: Simplify mas_wr_node_walk()

Simplify code of mas_wr_node_walk() without changing functionality,
and improve readability.

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 lib/maple_tree.c | 34 +++++-----------------------------
 1 file changed, 5 insertions(+), 29 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index b3164266cfde..4d15202a0692 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -2251,9 +2251,7 @@ static inline struct maple_enode *mte_node_or_none(struct maple_enode *enode)
 static inline void mas_wr_node_walk(struct ma_wr_state *wr_mas)
 {
 	struct ma_state *mas = wr_mas->mas;
-	unsigned char count;
-	unsigned char offset;
-	unsigned long index, min, max;
+	unsigned char count, offset;
 
 	if (unlikely(ma_is_dense(wr_mas->type))) {
 		wr_mas->r_max = wr_mas->r_min = mas->index;
@@ -2266,34 +2264,12 @@ static inline void mas_wr_node_walk(struct ma_wr_state *wr_mas)
 	count = wr_mas->node_end = ma_data_end(wr_mas->node, wr_mas->type,
 					       wr_mas->pivots, mas->max);
 	offset = mas->offset;
-	min = mas_safe_min(mas, wr_mas->pivots, offset);
-	if (unlikely(offset == count))
-		goto max;
-
-	max = wr_mas->pivots[offset];
-	index = mas->index;
-	if (unlikely(index <= max))
-		goto done;
-
-	if (unlikely(!max && offset))
-		goto max;
 
-	min = max + 1;
-	while (++offset < count) {
-		max = wr_mas->pivots[offset];
-		if (index <= max)
-			goto done;
-		else if (unlikely(!max))
-			break;
-
-		min = max + 1;
-	}
+	while (offset < count && mas->index > wr_mas->pivots[offset])
+		offset++;
 
-max:
-	max = mas->max;
-done:
-	wr_mas->r_max = max;
-	wr_mas->r_min = min;
+	wr_mas->r_max = offset < count ? wr_mas->pivots[offset] : mas->max;
+	wr_mas->r_min = mas_safe_min(mas, wr_mas->pivots, offset);
 	wr_mas->offset_end = mas->offset = offset;
 }
 
-- 
2.20.1